Gjesteforelesninger og seminarer - Side 19

This is a partial report on a joint work with G. Garkusha. The triangulated category of framed bispectra SH^fr_nis(k) is introduced. This triangulated category only uses Nisnevich local equivalences and has nothing to do with any kind of motivic equivalences. It is proved that SH^fr_nis(k) recovers the classical Morel-Voevodsky triangulated categories of bispectra SH(k), provided the base field k is infinite and perfect.

Emanuele Gramuglia (Department of Mathematics, University of Oslo) will give a talk on October 9th at 14:15 in the Seminar Room 819, Niels Henrik Abels hus, 8th floor.

Ingrid Van Keilegom (Department of OR and Business Statistics, Catholic University of Leuven) will give a talk on Monday, October 1st at 14:15 in the Seminar Room 819, Niels Henrik Abels hus, 8th floor.

Rebecka Jörnsten (Division of Applied Mathematics and Statistics, University of Gothenburg / Chalmers University of Techology) will give a talk on September 28th at 9:15 in the Seminar Room 819, Niels Henrik Abels hus, 8th floor.

Giuliana Cortese (Department of Statistical Sciences, University of Padova) will give a talk on September 25th at 14:15 in the Seminar Room 819, Niels Henrik Abels hus, 8th floor.

Matematisk Institutt ved Universitetet i Oslo ønsker deg med dette velkommen til en forsikringsdag der noen av landets topp fagfolk vil ta deg med gjennom noen av de mest dagsaktuelle emner innen forsikring.

Vi er er landets ledende leverandør av aktuarer og finansmatematikere til forsikrings- og finansnæringen og også det ledende forskningsenter på disse feltene.

Prof. Masaki Izumi, Kyoto University, Japan, will give a talk with title:

The classification of poly-Z group actions on Kirchberg algebras

Abstract: We completely classify outer actions of a poly-Z group G on any Kirchberg algebra A in terms of a principal Aut(A x K)-bundle over the classifying space BG. This is joint work with Hiroki Matui.

Becky Armstrong, University of Sydney, Australia, will give a talk with title:

Simple graph algebras

Abstract: Since their introduction twenty years ago, C*-algebras associated to directed graphs have become a popular tool for investigating various classes of C*-algebras, because analytical properties of these C*-algebras depend on much simpler combinatorial properties of the underlying graphs. One such analytical property is simplicity, which plays a fundamental role in the classification program for C*-algebras. In this talk I will first recall the characterisation of simplicity for directed graph C*-algebras. I will then describe the results of my PhD research, in which I characterise simplicity of twisted C*-algebras of topological higher-rank graphs in terms of the underlying graphical and cohomological data. These C*-algebras are constructed using groupoid techniques for the purpose of this simplicity characterisation, but I will also briefly describe two product-system models for twisted C*-algebras of topological higher-rank graphs. (This is joint work with my PhD supervisors, Nathan Brownlowe and Aidan Sims.)

Geoff Nicholls (Department of Statistics, University of Oxford) and Idris Eckley (Mathematics and Statistics, Lancaster University) will both give a talk on September 17th, at 13:45 and 14:45, respectively, in the Seminar Room 819, Niels Henrik Abels hus, 8th floor.

Title: Taming nonlinear dynamics using Deep Reinforcement Learning

by: Jean Rabault, Miroslav Kuchta, Ulysse Réglade and Nicolas Cerardi

Abstract: Machine Learning (ML) methods are a promising way to perform optimal control. In a recent book ('Machine Learning Control - Taming Nonlinear Dynamics and Turbulence', Duriez et. al., 2017), several ML methods were presented as well as a couple of benchmarks. One particular benchmark is a small system of ODEs that present features, such as multimodality and cross-talks, that are representative of more complex systems found in Fluid Mechanics.

In this seminar, we present ongoing work about active control of this system of ODEs.

Paolo Vidoni (Department of Economics and Statistics, University of Udine) will give a talk on September 4th at 14:15 in the Seminar Room 819, Niels Henrik Abels hus, 8th floor.

The Mahowald invariant is a method for constructing nontrivial classes in the stable homotopy groups of spheres from lower dimensional classes. I will introduce this construction and recall Mahowald and Ravenel's computation of the Mahowald invariant of 2^i for all i . I'll then introduce motivic and equivariant analogs of the Mahowald invariant, outline the computation of the generalized Mahowald invariants of 2^i and \eta^i for all i , and discuss the relationship between these generalized computations and exotic periodicity in the equivariant and motivic stable homotopy groups of spheres.

Christophe Henry

Post doc at Observatoire de la Cote d'Azur, Laboratoire Lagrange

Nordfjordeid Summer school 2018

A seminar in the honour of Erik Bølviken at his 70’th birthday.

Kostiantyn Ralchenko (Taras Shevchenko National University of Kyiv) gives a lecture with the title: Maximum likelihood estimation for drift parameter of Gaussian process.